[crac] RFR: Print socket additional info which still opened on checkpoint

[Roman Marchenko]

Added printing for socket port.

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Commit messages:
 - Print socket port still opened on checkpoint

Changes: https://git.openjdk.org/crac/pull/142/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=142&range=00
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/142.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/142/head:pull/142

PR: https://git.openjdk.org/crac/pull/142